# BotViewer Additions

- [Base Extension](/examples/botviewer-additions/base-extension.md): Base extensions for the Bot Viewer get called as soon as the user connects to the bot's server.
- [Chat Command Based Extension](/examples/botviewer-additions/chat-command-based-extension.md): These chat commands can be discovered through the !help command. Chat Command Based Extensions get invoked once the user sends a chat message with the desired keyword (Name variable).